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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b9a1c5f58d315f098b2ca80ee586b4aef947e1d20fefc2fd3dd7011b30a611' 
  AND token = 'Dm1tfysXsD7CJHSn7284kAsmvp1IcwONRQZOIuXoCM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}